Im sorry im not understanding what you are asking
Assuming that this is asking for an average estimation, the mean (average) would be 50 (42+26+61+65+56) divided by 5). So your answer would be 50
Is this grade 10 or 11 math? I’m only familiar with grade 10 math so if the question means zero as in root or point on x-axis, the zero is 3
12.3 hope it helps you would round the .25 up to .3 giving you 12.3